Koakutsu T., Nakajo J., Morozumi N., Hoshikawa T., Ogawa S. and Ishii Y. (2011) “Cervical myelopathy due to degenerative spondylolisthesis”, Upsala Journal of Medical Sciences, 116(2), pp. 129–132. doi: 10.3109/03009734.2011.551932.